Dust collector



April 26, 1938. w. s. BOWEN DUST coLLEcToR Filed Dec. 2, 1956 INVENTOR.,I laezwowel'l,

[lf/lian:

l/S ATTORNEYS Patented Apr. 26,

UNITED STATES 1 .1i'r-1-: 1-1'r OFFICE.;

The present invention relates to devices for separating bodies ofdifferent weights yfrom Vone another and embodies. more specically, animproved form of mechanism for separating and collecting dust from air.As distinguished fromvarious forms of mechanism now available. thepresent invention utilizes a straight or uni-dlrectional ilow ratherthan a reversal or'non-unidirectional ow, which'is characteristic of ex10' isting devices. In eifecting a separating action v. uponthesubstance'which is subjected to the unidirectional ilow, the presentinvention contemplates subjecting the bodies to a rapidly whirlingmotion and directing them through a Venturi' 15 mechanism, the venturibeing formed with a slot in its throat portion to eflect the separationof the heavier body from the'lighter one. Inasl much as the substance isdirected in an axial direction through the venturi. and while movingaxially is at the same time rapidly whirling `about such axis, theheavier particlesv are directed outwardly and away from the axis ofwhirl, the lighter edium being displaced inwardly and adjacent e axis ofwhirl.

Since all Venturi mechanisms include a converging portion, the velocityof the' whirling medium is greatly increased which, translated into`terms of centrifugal force, means that the centrii'ugal force is evenmore greatly increased bei go'cause it varies as the square of thevelocity of the medium. As a result, when the substance' reaches thethroat portion of the venturi, the heavier particles are maintainedclosely adjacent the walls of the device and are eilfectively sepa- 35rated from the lighter fluid body by means. of a and which matured intePac. No; 2.1182242, June 1,'1937. The separating device is disclosed inapplicantsjabove identied oo-pending application. Thepresent applicationrelates in addition '45 to collecting mechanisms, and includes thehereinafter specically described apparatus, not

' shown or described in applicant's above identiiied copendingapplication, by means- 'of which collection is i'acilitatede.

' 50. An object of the invention, accordingly, 'is to provideaseparating mechanism by means of 'I l' which heavier bodies may beseparated from a lighter medium in a highly emcient manner and with theminimumamount-of disturbance to the 5:5 medium.

A further object of the invention is to provide an imprved form ofseparating mechanism embodying the venturi principleA in controlling theflow of the medium upon which a separating ac- -tion is taking place Afurther object 'of the invention is to provide an improved collectingmechanism bymeans of which collection of material which has beenseparated by means of a uni-directional separating mechanism isfacilitated. '1

A further object of the invention is to provide an improved separatingand collecting mecha- .nism by means of which one medium may beseparated from another having a dierent speciilc weight in such fashionas. to preserve conditions 15 Figure 1 is a plan view of aseparatingmecha 'nism constructed in accordance with the presentinvention.

Figure 2 is a' view showing. a modiied form of 30 such mechanism whereina collecting chamber is provided which is sealed from the atmosphere.

Figure 3v is a view in'end elevation showing a separating andlcollecting mechanism constructed in accordance with the presentinvention. 35

Figure 4 is a view in side elevation of the mechanism shown in Figure 3.

Figure 5 is a plan view of the device shown in Figures-Sandi Referringto the above drawing, anintake tube 40 il .(Figure l) receives a mediumfrom a desired source and subjects the same to a whirling motion bymeans of vanes il. From the tube 'Il and vanes Il, the medium ilows intoa conical con verging portion li2 which terminates-in a cylinv 45 dricalportion i3 and an outwardly iiaring skirt i4. Axially disposedwithrespect to the intake tube I0 is an exhaust 'tube whichmay be formedwith a squared end I5 and an elongated Vtapering tubular portion I6having an inlet end I1 which 5o is received within the skirt Il and isof a diameter `less than that of the-cylindrical portion 4|310! the tubei0; A desired overlap of the skirt and intake end i'l` ofthe tubularportion Itis provided, an annular slot indicated at il thus beingprovided l5 nection with the accompanying drawing, where- 25V y.

between the cylindrical portion I2 andthe inlet end l1. It will,thus beseen that the above described mechanism, shownin vlillgure l, provides a-Venturi'mechanism,whereby the ilow of iiuid therethrough isuni-directional and .follows the law which governs the ow of iiuidthrough the venturis. Inasmuch as the whirling of the entering iluid isenormously increased by the converging portion l2, the slot il may berelatively narrow and still effectively skim oi! the heavier particlesfrom the lighter medium which ows4 out through the extremity I5 andl isrestored to its original pressure and1velocity state by the expanding.portion Ii of the venturis. This mechanism is shown and described inapplicants copending Aapplication above identiiled.v

In the construction shown in Figure 2, the converging Venturi inletportion |2 terminates in a collecting chamber I9 having an outlet valve20 formed at the bottom thereof in order that the interior of thechamber may be enclosed and .not subject to atmospheric pressure. TheVenturi outlet-tube I6 is received within the chamber I9 and the inletend -I'I thereof spaced adjacent the outlet oi the converging portion i2in order that the annular slot il may be formed between these elements.In the drawing, this annular slot is shown as being much larger thantains a' partial vacuum'within this chamber and facilitates separationof the heavier body from the lighter one. This condition exists byreason of the fact that the heavier bodies move into the region 'of lowwithin the chamber i9 more readily than they would move into a region ofhigher pressure.

-In the construction shown in Figures 3, 4, and 5, uid is introducedinto the mechanism through a conduit 2l which terminates in oppositelyextending scrolls 22 andl 22 which impart a whirling motion to the twoiluid .streams thus formed. 'I'he scrolls 22 and 23 discharge themediuminto converging Venturi portions 24 and 25 respectively. Venturi outletportions 2l and 21Acarry the lighter medium away and deliver ittoreceiving scrolls 2l and 29, respectively, which'maybe in the iormofcyclone collectors which are now well known in the art, These cyclonecollectors may discharge the lighter, medium through a dischargemanifold 2l and return heavier medium. which has escaped the initialseparating stage by means of cyclone outlets 3|. Y The initialseparating action whichtakes place between the converging Venturi inletportions 24 and 25 and the diverging Venturi. outlet portions .i

26 and 21 is effected by means a annular slots '32 and It in therespective ven These slots are formed'in the same mannergjf" describedin conection withtheconstructionfshown in Figures land 2 andcausetheheavier particles to. be skimmed oil' and received within collectingchambers I4 and ll, respectively. From the jthan said converging portionand denning an annular opening therebetween, a collecting hop-- "theatmosphere. collecting chambers, the heavier bodiesare den 2,1 lassolivered through ducts 36 to a common discharge valve 31 which suppliesthe medium',I to a conveyor 38. Cyclone outlets 3| may also supply thereturned heavy particles to the conveyor 38 through similar valves 31.-5

' forming an opening between saidconverging and inlet portions, a hoppercommunicating with said converging portion4 through said opening, only,and means for sealing .the hopper from communication with the atmosphereto maintain a reduced pressure inthe hopper.

2. A separating and collecting device comprising an inlet chamber havinga converging oute let portion, a coaxial outlet chamber havinga taperedinlet portion of smaller diameter than v the outlet portion of .saidinlet chamber, deiining an opening between the outlet and inletportions, and a' collecting hopper communicating with said outletportion through said opening, only, and

means for sealing hopper from the atmosphere to maintain a reducedpressure in the hopper;

3. A separating and collecting device comprising an inlet chamber havingaconverging outlet portion, a coaxial outlet chamber having a taperinginlet portion adjacent to, in alignment with and of lesser diameter thansaid outlet portion whereby'an opening is formed between said outlet andinlet portions. a collecting hopper communicating with said-.outletportion through said opening, only, and a valve for sealing the hopperimm the atmosphere.

4. A separating and collecting device comprising an inlet chamber havinga tapering venturi portion, an outlet chamber having a tapering inlet oflesser diameter than said Venturi portion aligned with and spaced fromsaid Venturi portion whereby an opening is formed between said venturiportion and, said inlet. portion, a collecting hopper communicating withsaid Venturi portion through saidl opening, only, and a valve forsealing the hopper against communication with the atmosphere to maintaina. reduced pressure in the hopper.A

A 5. A separating device comprising an inlet chamber having a.converging portion, an outlet chamber having a tapered inlet portionadjacent to and .ln 'alignment with said convergingportion, said inletportion being' of less diameter per ciimmunicating with said convergingportion through said annular opening, only, and'means i'or sealing thehopper from communication with

